Humor could not flourish in a wholly serious and rational atmosphere. - Raymond Smullyan

From what little was known about the subject, insincerity itself was regarded as another form of psychosis but one which was exceedingly rare.

There is nothing like a naturalistic orientation to dispel all these morbid thoughts of "sin" and "free will" and "moral responsibility."

If it is really true that you cannot resist them, then you are not sinning of your own free will and hence (at least according to me) not sinning at all.